It was just a sort of attraction that you had for some period of time, and it faded with the time passage.
Because best friends aren't supposed to do that to you, there supposed to help you and be mad at them because that person broke your heart.
Walk away and come back when the mood has shifted.
It will make them think of you as someone who likes to take control of personal issues, and make them miss you.
What do you think can you ever stop loving the person you truly loved? The spell to make someone fall out of love with you is a very powerful remedy to get out of an unwanted relationship.
So it's always a good practice to turn our attention to ourselves as soon as we realize we are annoyed with someone else.